Pulsafeeder PULSAlarm - Manual (Page 18)

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5.2.2 Inspection
Remove and inspect the diaphragm assembly. It may have taken a permanent convex/concave set
as a result of normal flexure and conformance to the dish-plate. This condition is normal and is
not cause for replacement. The diaphragm must be replaced if it is deformed, dimpled, or
obviously damaged.
If the diaphragms have been removed from the spacer ring, the entire assembly
should be replaced to ensure proper sealing of its components.
5.2.3 PULSAlarm Diaphragm Reinstallation
1. Ensure that the critical sealing areas of diaphragm assembly, reagent head, and pump head
are clean and free from debris. Align the diaphragm assembly capillary tubes with mating
holes in the seal groove in the reagent head and position it in place against the reagent head.
Ensure seating of the diaphragm sealing ring into the mating groove in the reagent head.
2. Install the reagent head bolts and tighten in an alternating pattern to ensure an even seating
force. Torque to the values recommended in the Installation, Operation, and Maintenance
manual appropriate to the pump.
3. Apply sealing compound to the gauge/pressure switch assembly and reinstall to the upper
port on the reagent head.
4. Apply sealing compound to the fill valve assembly and reinstall to the lower port on the
reagent head.
5. Open the needle valve
6. Connect a hand-held vacuum pump or other vacuum source to the vacuum port, which fits 6
mm (1/4 in.) I.D. tubing.
7. For a vacuum system, evacuate to approximately 650 mm Hg (26 in. Hg) and securely
tighten the needle valve after evacuation. Diaphragm damage or decreased flow will occur
if a vacuum is not drawn before the pump is returned to service. Refer to Section 3 “Setup
for Vacuum”.
8. For a pressure system, see Section 4, “Setup for Pressure”
9. Re-prime the pump head hydraulic system
10. If required, test vacuum or pressure system operation.
11. After diaphragm set-up and priming, the pump is ready to be returned to service.